检索结果-南通市图书馆

Journal of Materials Science & Technology 2013年第1期29卷 49-54页

作者： Fatemeh Heydari Amir Maghsoudipour Zohreh Hamnabard Sajad Farhangdoust ceramic Division Material and Energy Research Center ceramic Group Materials Research School

To develop suitable sealants for intermediate temperature solid oxide fuel cells （IT-SOFC）, glass-ceramics based on the CaO-BaO-B203-AI203-Si02 system were studied. Coefficient of thermal expansion （CTE）, glass transition temperature （Tg） and dilatometric softening point temperature （Td） of specimens were determined by means of dilatometer analysis and crystallization temperature was measured by differential thermal analysis （DTA）. Also, crystallization behavior during prolonged heat-treatment and microstructure properties were studied by means of X-ray diffraction （XRD） and scanning electron microscopy （SEM）, respectively. Electrical properties were measured at different temperatures, and the results showed a high resistance （〉104 Ω） at the SOFC operation temperature （600-800 ℃）. Moreover, mechanical properties of heat-treated specimens （1, 10, 30, 50 h） were measured, Microstructure investigation revealed a well-adhered bonding between the sealant glass-ceramic electrolyte and glass.

关键词： Glass Solid oxide fuel cells (SOFC) Thermal expansion Mechanical properties Electrical properties

Wear Characteristics of Zirconia Toughened ceramic Drawing Dies

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 1995年第5期11卷 380-384页

作者： Zhigang CHEN (ceramic research lab., Jiangsu University of Science and Technology, 212013, Zhenjiang, China) ceramic research lab Jiangsu Univ of Science and Technology Nanjing China

Wear resistance of several zirconia toughened ceramics in comparison with a metal-ceramic Co-WC has been studied in drawing wire field test. Result indicates that the harder the ceramic die, the longer the service life. Excellent wear resistance of ceramic die is obtained with a very high hardness (19 GPa). The service life is nearly three times that of Co-WC die. SEM observation on wear surfaces showed that material removal is mainly caused by plastic flow and ploughing process. But when the ceramic is composed of zirconia, alumina and some titanium carbide, micro-chipping and tribochemical reaction take place, and wear rate increases. Wear and friction induced martensite was detected by XRD. The T-M (tetragonal to monoclinic) phase transformation has a contribution to inhibiting microfracture.

关键词： WC Wear Characteristics of Zirconia Toughened ceramic Drawing Dies

Secretome of polarized macrophages:potential for targeting inflammatory dynamics in spinal cord injury

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration research 2025年第11期20卷 3231-3232页

作者： Andreia Monteiro Susana Monteiro Nuno A.Silva Life and Health Sciences research Institute(ICVS) School of MedicineUniversity of MinhoBragaPortugal ICVS/3B’s Associate lab PT Government Associated LabBraga/GuimaraesPortugal

Spinal cord injury(SCI)involves an initial traumatic phase,followed by secondary events such as ischemia,increased blood-spinal cord barrier permeability,ionic disruption,glutamate excitotoxicity,and metabolic alterations.A pe rsistent and exagge rated inflammato ry response within the spinal cord accompanies these events(Lima et al.,2022).The complexity and interplay of these mechanisms exacerbate the initial injury,leading to a degenerative process at the injury *** the initial trauma is unavoidable,the secondary injury begins within minutes and can last for months,creating an optimal window for therapeutic intervention.

关键词： alterations injury companies

Anti-amyloid antibodies in Alzheimer’s disease: what did clinical trials teach us?

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration research 2025年第4期20卷 1092-1093页

作者： Danko Jeremic Lydia Jiménez-Díaz Juan D.Navarro-López NeuroPhysiology&Behavior lab University of Castilla-La ManchaBiomedical Research Center(CRIB)School of Medicine of Ciudad RealCiudad RealSpain

Although many causes of Alzheimer’s disease(AD)may exist,both the original amyloid cascade and tau hypotheses posit that abnormal misfolding and accumulation of amyloid-β(Aβ)and tau protein is the central event causing the ***,that conclusion could be only partly true,and there is conflicting evidence about the role of both proteins in AD,being able to precede and influence one *** researchers argue that these proteins are mere executors rather than primary causes of ***,there have been continuing refinements of both hypotheses,with alternative explanations proposed.Aβand tau proteins may be independently involved in specific neurotoxic pathways;yet there may be other crucial processes going on in early ***,accumulating evidence suggests that Aβand tau act synergistically,rather than additively in disease onset(Jeremic et al.,2021,2023a).

关键词： amyloid Alzheimer additive

Combinatorial therapies for spinal cord injury repair

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration research 2025年第5期20卷 1293-1308页

作者： Carla S.Sousa Andreia Monteiro António J.Salgado Nuno A.Silva Life and Health Sciences research Institute(ICVS) School of MedicineUniversity of MinhoCampus de Gualtar-gualtarBragaPortugal ICVS/3B’s Associate lab PT Government Associated LabCampus de Gualtar-gualtarBragaPortugal

Spinal cord injuries have profound detrimental effects on individuals, regardless of whether they are caused by trauma or non-traumatic events. The compromised regeneration of the spinal cord is primarily attributed to damaged neurons, inhibitory molecules, dysfunctional immune response, and glial scarring. Unfortunately, currently, there are no effective treatments available that can fully repair the spinal cord and improve functional outcomes. Nevertheless, numerous pre-clinical approaches have been studied for spinal cord injury recovery, including using biomaterials, cells, drugs, or technological-based strategies. Combinatorial treatments, which target various aspects of spinal cord injury pathophysiology, have been extensively tested in the last decade. These approaches aim to synergistically enhance repair processes by addressing various obstacles faced during spinal cord regeneration. Thus, this review intends to provide scientists and clinicians with an overview of pre-clinical combinatorial approaches that have been developed toward the solution of spinal cord regeneration as well as update the current knowledge about spinal cord injury pathophysiology with an emphasis on the current clinical management.

关键词： electric stimulation neural tissue regeneration neuroprotection polytherapy spinal cord injury

Development of non-shrinkable ceramic composites for use in high-power microwave tubes

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2019年第4期26卷 516-522页

作者： N.Dandapat S.Ghosh Bioceramics and Coating Division CSIR-Central Glass and Ceramic Research Institute

Al_2O_3–CaO–SiC-based ceramic composites with four different compositions were sintered at 1700℃ for 3 h in an air furnace. The phase analysis, microstructural characterization, and elemental composition determination of the developed composites were performed by X-ray diffraction(XRD), field-emission scanning electron microscopy(FESEM), and energy-dispersive X-ray(EDAX) analysis, respectively. The shrinkage, thermal properties, and electrical resistivity of the composites were also studied. The experimental results showed the effects of adding silicon carbide and calcia to alumina on the thermal, electrical, and shrinkage properties of the resultant composites. Among the four investigated ceramic composites, the one composed of 99 wt% alumina, 0.5 wt% CaO, and 0.5 wt% SiC exhibited the best characteristics for use as a potting material in a dispenser cathode of a microwave tube. The material exhibited slight expansion instead of shrinkage during drying or firing. Other properties of the composite powder, such as its thermal properties and electrical resistivity, were comparable to those of a commercial alumina powder.

关键词： Al2O3-CaO-SiC composite expansion potting material dispenser cathode microwave tube

BS_(0.5)BNT-based relaxor ferroelectric ceramic/glass-ceramic composites for energy storage

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced ceramics 2023年第4期12卷 695-710页

作者： Xuhai Shi Kai Li Zong-Yang Shen Junqi Liu Chaoqun Chen Xiaojun Zeng Bo Zhang Fusheng Song Wenqin Luo Zhumei Wang Yueming Li China National Light Industry Key laboratory of Functional ceramic Materials Energy Storage and Conversion Ceramic Materials Engineering Laboratory of Jiangxi ProvinceAdvanced Ceramic Materials Research InstituteSchool of Materials Science and EngineeringJingdezhen Ceramic UniversityJingdezhen 333403China

Relaxor ferroelectric ceramics have very high dielectric constant(e)but relatively low electrical breakdown strength(Eb),while glass-ceramics exhibit higher E,due to the more uniformly dispersed amorphous phases and submicrocrystals/nanocrystals *** to effectively combine the advantages of both relaxor ferroelectric ceramics and glass-ceramics is of great significance for the development of new dielectric materials with high energy storage *** this work,we firstly prepared BaO-SrO-Bi_(2)O_(3)-Na_(2)0-TiO_(2)-Al_(2)O_(3)-SiO_(2)(abbreviated as GS)glass powders,and then fabricated(Ba_(0.3)Sr_(0.7))_(0.5)(Bi_(0.5)Na_(0.5))_(0.5)TiO_(3)+x wt%GS ceramic composites(abbreviated as ***-xGS,x=0,2,6,10,14,16,and 18).Submicrocrystals/nanocrystals with a similar composition to *** were crystalized from the glass,ensuring the formation of uniform core-shell structure in ***-xGS relaxor ferroelectric ceramic/glass-ceramic *** the addition amount of GS was 14 wt%,the composite possessed both high&r(>3200 at 1 kHz)and high E,(~170 kV/cm)at room temperature,and their recoverable energy storage density and efficiency were Wrec=2.1 J/cm’and n=65.2%,*** ***-14GS composite also had several attractive properties such as good temperature,frequency,cycle stability,and fast charge-discharge *** work provides insights into the relaxor ceramic/glass-ceramic composites for pulsed power capacitors and sheds light on the utilization of the hybrid systems.

关键词： relaxor ferroelectrics energy storage ceramics glass-ceramics Bi_(0.5)Na_(0.5)TiO_(3)(BNT) Ba_(0.3)Sr_(0.7)TiO_(3)(BST)

Observation of trapped light induced by Dwarf Dirac-cone in out-of-plane condition for photonic crystals

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2016年第10期25卷 314-322页

作者： Subir Majumder Tushar Biswas Shaymal K Bhadra Fiber Optics and Photonics Division CSIR-Central Glass and Ceramic Research Institute

Existence of out-of-plane conical dispersion for a triangular photonic crystal lattice is reported. It is observed that conical dispersion is maintained for a number of out-of-plane wave vectors（k;）. We study a case where Dirac like linear dispersion exists but the photonic density of states is not vanishing, called Dwarf Dirac cone（DDC） which does not support localized modes. We demonstrate the trapping of such modes by introducing defects in the crystal. Interestingly, we find by k-point sampling as well as by tuning trapped frequency that such a conical dispersion has an inherent light confining property and it is governed by neither of the known wave confining mechanisms like total internal reflection, band gap guidance. Our study reveals that such a conical dispersion in a non-vanishing photonic density of states induces unexpected intense trapping of light compared with those at other points in the continuum. Such studies provoke fabrication of new devices with exciting properties and new functionalities.

关键词： band structure photonic band gap materials multilayers superlattices photonic structures meta-materials

Wood-like polymeric materials by ice templating

在线全文

学校读者我要写书评

暂无评论

National Science Review 2019年第2期6卷 184-185页

作者： Sylvain Deville ceramic Synthesis and Functionalization laboratory National Center for Scientific Research

The ice-templating method, also called freeze-casting and directional freezing,is a powerful technique for processing nanomaterials, polymers and engineering materials into various porous and dense materials [1,2] that has received considerable attention. Ice templating is mostly used to fabricate macroporous materials, with elongated pores in the5–50μm size range. Because the underlying mechanisms—the segregation of matter by the growing crystals—are

关键词： Wood-like polymeric materials by ice templating

A review:(Bi,Na)TiO_(3)(BNT)-based energy storage ceramics

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Materiomics 2024年第1期10卷 86-123页

作者： Wen Zhu Zong-Yang Shen Wei Deng Kai Li Wenqin Luo Fusheng Song Xiaojun Zeng Zhumei Wang Yueming Li Advanced ceramic Materials research Institute China National Light Industry Key Laboratory of Functional Ceramic MaterialsEnergy Storage and Conversion Ceramic Materials Engineering Laboratory of Jiangxi ProvinceSchool of Materials Science and EngineeringJingdezhen Ceramic UniversityJingdezhen333403China

Facing the increasingly serious energy and environmental problems,the research and development of new energy storage technology and environment-friendly energy storage materials are *** a typical lead-free ferroelectric with excellent dielectric properties,(Bi,Na)TiO_(3)(BNT)is supposed to be the most potential and competitive environment-friendly ceramic material and has become a research hotspot for dielectric energy storage in recent *** paper first briefly introduces the basic physical principles and energy storage performance evaluation parameters of dielectric energy storage materials,then summarizes the critical research systems and related progress of BNT-based lead-free energy storage materials(bulk ceramics,films and multilayer ceramics)from the aspects of ions doping modification and multi-component composite optimization,and finally looks forward to the improvement direction and energy storage application prospect of BNT-based lead-free relaxor ferroelectric materials.

关键词： Dielectrics Relaxor ferroelectrics Energy storage ceramics Sodium bismuth titanate Lead free